According to a 2016 study medical cannabis legalization is associated with a reduction in traffic fatalities – particularly among those between the ages of 25 and 44.

A 2017 study published in the American Journal of Public Health similarly reported ‘no significant association between recreational marijuana legalization in Washington and Colorado and subsequent changes in motor vehicle fatality rates in the first three years after recreational marijuana legalization.… ‘[W]e also found no association between recreational marijuana legalization and total crash rates when analyzing available state-reported nonfatal crash statistics’.